I have Anxiety, Panic Disorder, Agoraphobia, OCD and Depression. I was told my racing heart was my anxiety for 10 years. (Because a racing heart IS a symptom of anxiety and panic attacks) I had a holter monitor done and EKG's and all came back fine. Everytime my heart would race, it was never hooked up to a machine tho. Finally I had another holter moniter done and it caught a very very brief racing of heart. It showed I had SVT. I knew I had something else going on, and they put me on propanolol. It has helped it tremendously, but not gone entirely. Interestling, anxiety and stress actually bring on the svt. Go figure.
I do not tell you this to scare you, and this is not a dangerous condition, it just reminded me of my history. By the way, I have the tingling and my Hang in there and feel better!
I wouldn't worry too much over the tingling if it mostly happens after being on the computer for awhile. Could be the beginning of carpal tunnel syndrome due to pressure on the wrist when using the keyboard or mouse. Also may even have to do with the circulation being temporarily impaired. See a doc about that anxiety. Adrenaline can make you heartbeat speed up and anxiety could certainly be the cause of that. Good luck.
The tingling could be from many things including anxiety. You've had heart problems ruled out so I definitely wouldn't worry about that. I would ask your doctor about the tingling which is what I suggest to anyone who encounters a new symptom. When you feel your heart racing try doing several deep breathing exercises....slow deep breaths in thru you nose and slowly out of your mouth. This should calm you and slow down your heart rate. Don't worry that it's your heart this will make things worse and there is no need. If the tingling continues do see your doctor if just to ease your mind. Hope this helps.